36
Relations between various operating points of the motor:
Example 3 Phase Supply:
Line voltage: 400 V, 50 Hz;
Voltage drop commutating reactor: 4%
voltage at SINAMICS DCM input: 384 V
Motor: 1GG6208-0NH40-1VV3; 2020 UPM; 183 kW
U
N
: 420 V, I
N
: 466 A, : 91%, Ra: 43.8 m , La: 0.94 mH
Calculation with motor rating data; no smoothing reactor n
N
, I
N
, U
N
= 36 degrees, the
resulting current ripple is 11.5 % rms
As above for smoothing reactor 1.5 mH, the resulting current ripple is 4.5 % rms
Half the rated motor speed, without smoothing reactor, I
N
,
= 65 degrees
When motor speed is zero, I
N
,
= 88
degrees; the resulting current ripple is 19% rms
U-Last (Motor)
0
100
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0
2
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10
Zeit in [ms]
U
in
[
V
]
Laststrom
0
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0
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10
Zeit in [ms]
Id
c
i
n
[
A
]
U-Last (Motor)
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0
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Zeit in [ms]
U
in
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V
]
Laststrom
440
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490
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510
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2
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10
Zeit in [ms]
Id
c
in
[
A
]
U-Last (Motor)
-100
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Zeit in [ms]
U
in
[
V
]
Laststrom
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0
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Zeit in [ms]
Id
c
in
[
A
]
Motor armature voltage
Load current
Time in [ms]
Time in [ms]
Time in [ms]
Time in [ms]
Time in [ms]
Load current
Load current
Motor armature voltage
Motor armature voltage
